/Engine/Source/Editor/PropertyEditor/Public/IDetailsView.h
Returns the row number in the underlying TableView for each property being displayed. Note this won't include any properties that are apart of a collapsed section of the property tree because those properties don't have row numbers. If you need a list of all properties independent of expansion state, use GetPropertiesInOrderDisplayed
[TArray](API\Runtime\Core\Containers\TArray)< TPair< int32, [FPropertyPath](API\Editor\PropertyEditor\FPropertyPath) > > GetPropertyRowNumbers() const